US3950235A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolytic method of producing branched perfluoro-alkanes
Assignee: Hoechst AG
•
Filing: 1974-11-15
•
Granted: 1976-04-13
•
Expires: 1994-11-15
Abstract
Abstract Branched perfluoro-olefins are electrofluorinated in an electrolytic cell at about 4-6.6 volts at a temperature of from 0° to 20°C together with anhydrous hydrogen fluoride. Branched perfluoro-alkanes are obtained in high yield.
Inventors
- 👤 Siegfried Benninger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:53
CPC Classifications
C; C07; C07C; C07C19/00; C07C19/08; C25; C25B; C25B3/00; C25B3/01; C25B3/11; C25B3/20; C25B3/27; C25B3/28
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
58 words
A method for making a branched perfluoroalkane by electrofluorination in an electrolytic cell, which method comprises continuously or discontinuously electrolyzing an electrolyte, consisting essentially of anhydrous hydrogen fluoride and of at least one branched perfluoro-olefin having 6 to 12 carbon atoms, at a temperature from 0° to 20°C. and at a voltage from 4 to about 6.6 volts.
Claim 2
Independent Claim
58 words
A method for making a branched perfluoroalkane by electrofluorination in an electrolytic cell, which method comprises continuously or discontinuously electrolyzing an electrolyte, consisting essentially of anhydrous hydrogen fluoride and of at least one branched perfluoro-olefin having 6 to 12 carbon atoms, at a temperature from 0° to 20°C. and at a voltage from 4 to about 6.6 volts.
Claim 3
Dependent Claim
16 words
A method as in claim 1 wherein said perfluoro-olefin has from 6 to 9 carbon atoms.
Claim 4
Dependent Claim
17 words
A method as in claim 1 wherein said perfluoro-olefin is an oligomer of tetrafluoroethylene or of hexafluoropropene.
Claim 5
Dependent Claim
22 words
A method as in claim 1 wherein said perfluoro-olefin is a mixture of structural isomers having the same number of carbon atoms.
Claim 6
Dependent Claim
18 words
A method as in claim 1 wherein the electrolyte is electrolyzed at a temperature from 4°C. to 10°C.
Claim 7
Dependent Claim
19 words
A method as in claim 1 wherein the electrolyte is circulated in said electrolytic cell by a circulation pump.
References Cited (Backward Citations)
GB740723A
Cited
US3660254A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-13 | 1979-10-13 | 1980-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-13 | 1983-10-13 | 1984-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-13 | 1987-10-13 | 1988-04-13 | $7700.00 | Window Closed / Lapsed |